cos1∘ × cos2∘ × cos3∘ ×……..× cos180∘ is equal to ____

1.	cos1∘ × cos2∘ × cos3∘ ×……..× cos180∘ is equal to _________ .
Answer» cos $1^{\circ}$ $\times$ cos $2^{\circ}$ $\times$ cos $3^{\circ}$ $\times$ …….. $\times$ cos $180^{\circ}$ is equal to _________ .

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